Acta Cryst. (2009). E65, o2182-o2183  [ doi:10.1107/S1600536809031961 ]

2,2,6,6-Tetrakis(biphenyl-2-yl)-4,4,8,8-tetramethylcyclotetrasiloxane

E. P. A. Couzijn, M. Lutz, A. L. Spek and K. Lammertsma

Abstract: The title compound, [-Si(C₁₂H₉)₂OSi(CH₃)₂O-]₂, was obtained unintentionally as the product of an attempted crystallization of caesium bis(biphenyl-2,2'-diyl)fluorosilicate from dimethylformamide. In the crystal, the molecule is located on an inversion center and the siloxane ring adopts a twist-chair conformation with the two dimethyl-substituted Si atoms lying 0.7081 (5) Å out of the plane defined by the two bis(biphenyl-2-yl)-substituted Si atoms and the four O atoms. In each Si(C₁₂H₉)₂ unit, the orientation of one terminal phenyl ring relative to the phenylene ring of the other biphenyl moiety suggests a parallel displaced - stacking interaction [centroid distance = 4.2377 (11) Å and dihedral angle = 15.40 (9)°].

Online 19 August 2009

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